package com.cdx.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author chedx
 * @data 2020/12/6 3:26 PM
 */
@Component
public class MyLB implements LBService{

    private AtomicInteger atomicInteger = new AtomicInteger(0);

    public  final int getAndIncrement () {
        int current ;
        int next;
        do {
            current = this.atomicInteger.get();
            next = current >= Integer.MAX_VALUE ? 0 : current + 1;
        } while (!this.atomicInteger.compareAndSet(current,next));
        System.out.println("*****第几次访问，次数next: "+next);
        return next;
    }

    @Override
    public ServiceInstance instance(List<ServiceInstance> serviceInstances) {
        int index = getAndIncrement() % serviceInstances.size();
        return serviceInstances.get(index);
    }
}
